Saif Khan

• Provided dedicated support for ISP customer running Cisco ASR 9000 routers in core/aggregation layers.

• Diagnosed and resolved critical issues (e.g., RSP crashes, memory leaks, forwarding plane drops, BGP/MPLS instability).

• Led post-mortem analysis for network outages, providing RCA and preventive action plans.

• Assisted in software upgrades, bug scrubs, and hardware replacements to minimize downtime.

• Worked closely with Cisco TAC & R&D to escalate and resolve software defects (CSC bugs).

• Configured and managed core and edge routers, switches, and firewalls to provide secure and high-performance connectivity within the data centre and to remote sites.

• Implemented and managed routing protocols (IS-IS, BGP, MPLS) for efficient traffic routing, ensuring optimal data flow between.

• Collaborated with cross-functional teams (storage, virtualization, and security engineers) to integrate network infrastructure with server, storage, and application deployments.

• Performed network configuration changes and updates as per change management procedures.

• Designed and deployed traffic load balancing solutions to ensure optimal distribution of network traffic, improving application performance and reducing the risk of network bottlenecks.

• Assisted in the migration of legacy networks to modernized data centre environments, including transitioning from traditional VLAN-based architectures to VxLAN based models.

• Conducted troubleshooting and root cause analysis for network outages, ensuring fast resolution and minimal impact on business operations.

• Provided Tier 2/3 technical support for ISP customers, resolving MPLS VPN, BGP, and routing issues.

• Undertaking measures via auditing the network parameters to streamline the Network.

• Responsible for operational effectiveness of Core Data Networks & traffic engineering.

• Troubleshooting on Enterprise services MPLS VPN, L2VPN, Internet circuits.

• Working on Repeated faults to find RCA and plan of action to mitigate such issues in future related to Network Design or Network Devices.

• Managed network equipment configuration and maintenance, ensuring optimal performance.
• Resolved global network issues, enhancing connectivity for IPsec, DMVPN, and MPLS circuits.
• Coordinated hardware upgrades and device replacements, improving system reliability.
• Addressed client connectivity issues, boosting application performance and internet access.

• Led a team of 7-8 L2 engineers, ensuring timely resolution of P1/P2 incidents in ISP networks.

• Provided Tier-3 support for ISP customers, handling MPLS VPN, BGP, and DDoS mitigation.

• Conduct routine checks and troubleshooting to identify network anomalies, and implement corrective actions to minimize downtime and ensure optimal network performance.

• Collaborate with cross-functional teams to deploy, configure, and upgrade network infrastructure components, including routers, switches, firewalls, and other network devices.

• Perform network capacity planning and analysis to accommodate growth and ensure scalability of network resources.

• Document network configurations, procedures, and troubleshooting steps for knowledge sharing and future reference.

• Participate in on-call rotations to provide 24/7 support for critical network incidents and escalations.

• Handling a large network comprising of various dynamic protocols like OSPF, BGP, MPLS, ISIS, LDP, and RSVP.

• Up-gradation of Juniper/Cisco/Nokia routers and undertaking measures via auditing the network parameters to streamline the Network.

• Troubleshooting MPLS-IP related issue and Documenting network changes.

• Troubleshooting faults related to Mobility services such as 4G/3G/2G and Enterprise services such as DIA /MPLS/L2VPN circuits.

• Finding root cause analysis of any kind of Data/Voice network failure in terms of protocol & hardware faults and preparation of RCA.

• Diagnosed and resolved DSL/ISP technical issues (e.g., connectivity drops, slow speeds, PPPoE errors, line synchronization) via phone, chat, and remote tools.
• Guided customers through modem/router configuration (e.g., firmware updates, port forwarding, Wi-Fi optimization) and LAN/WAN settings.
• Analyzed DSL line stats (SNR margin, attenuation, sync rates) using ISP diagnostic tools (e.g., DSLAM, CMS) to identify physical layer issues.